The VTEM survey discovered four conductive responses of primary interest, all of them proximal to the Rawdon Fault Zone (RFZ) which is believed to have placed the prospective (for Zn, Pb and Cu mineralisation) lower units of the variably conductive Windsor Group rocks in faulted contact with the basement rocks of the older, and magnetic Meguma Super Group. These discoveries are supported by an extensive database of historic airborne/ground geophysical and drill hole data, including gravity, magnetic, EM and 2D seismic, and are now drill-ready. The area of the magnetic and conductive sources lies along the surface trace of the RFZ. The VTEM conductors of primary interest lie within the prospective lower units of the Windsor group rocks, coincident with discrete basement magnetic anomalies and a broader magnetic expression indicating near-surface proximity to the basement rocks.
Generation Mining has compiled a large geoscience database for the Kennetcook-Windsor and Shubenacadie basins in central Nova Scotia, for the purposes of identifying exploration properties permissive for the accumulation of economic base metal deposits. Reinterpretation of historical structural and geophysical data indicates that specific locations along the RFZ and associated structures are prospective for structurally controlled Zn-Pb base metal deposits. The RFZ is more than 100 km long and up to 1 km wide, on the Rawdon West property. The Rawdon West property includes a 40 km section of the RFZ where the Lower Windsor Group evaporitic rocks, to the north, have been structurally emplaced against the Fe-S rich slates, shales and sandstones of the Meguma rocks, to the south. A significant vertical component of motion is interpreted between the two rock groups, resulting in an upward folding, additional faulting and brecciation of the lower Windsor rocks in the vicinity of the RFZ and in direct contact with the Meguma rocks. Generation Mining believes that the structural deformation and uplifting of Lower Windsor Group rocks along the RFZ has facilitated migration of metal rich fluids and created an environment favourable for the accumulation of economic base metal deposits.
On the northern region of the Rawdon West property, the VTEM survey has detected a large area (greater than 2.5 km by 1.5 km) of discrete, conductive source rocks, associated with an unexplored area of the RFZ, that are believed to be prospective for Zn-Pb deposits. To the southeast, the layered Horton Group sediments, overlay the folded, irregular, and much older Meguma Basement. The south block of rocks is in sharp structural contact with the south side of the sub-vertically oriented RFZ. To the NW the Lower Windsor Group is in sharp contact with the north edge of the RFZ. A line of 15 historical ground gravity stations data collected along a profile directly above the magnetic anomaly confirm the presence of a dense source at modelled depths consistent with that estimated for the magnetic source at the same location. The VTEM response at the north edge of the RFZ and coincident with the magnetic/gravity anomaly, indicates a zone of very low resistivity beginning at approximately 200 m depth. The total magnetic intensity (TMI) profile clearly shows the presence of a magnetic contact to the west. The magnetic peak occurs off centre west of the estimated location of the VTEM anomaly source, imaged as the very low resistivity zone of approximately 1 km strike length, in the modeled VTEM section below the TMI profile. Consequently, the responses may be indicative of a location permissive to base metal mineralisation beginning at 200 m from the surface.
Generation Mining has also identified three other areas of exploration interest within the Rawdon West property and subject to financing the Company is planning a drilling programme later in 2019.
Notable deposits hosted in the Lower Windsor Group Rocks are the Walton Ba-Pb-Zn-Cu-Ag deposit (located 20 km west of the Rawdon West property), which produced 4.3 million t of barite along with 412 000 t of sulphide mineralisation grading 4.28% lead, 1.29% zinc, 0.52% copper and 350 grams/tonne silver; the Gays River mine (located 30 km southeast) which has a current measured and indicated resource of 12 205 000 t grading 2.76% zinc and 1.60% lead in several deposits; and the Smithfield deposit (located within the Rawdon East property on claims not owned by Generation Mining) which produced briefly in the 1880s, and in the 1950s reported a 500 000 t deposit grading 3.5% zinc and 2.7% lead.
Read the article online at: https://www.globalminingreview.com/exploration-development/08022019/generation-mining-releases-additional-results-from-rawdon-survey/